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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.collect;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.annotations.Beta;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.annotations.GwtCompatible;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.Collection;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.List;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.ListIterator;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.RandomAccess;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Set;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.SortedSet;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
<span class="sourceLineNo">032</span> * Factories and utilities pertaining to the {@link Constraint} interface.<a name="line.32"></a>
<span class="sourceLineNo">033</span> *<a name="line.33"></a>
<span class="sourceLineNo">034</span> * @see MapConstraints<a name="line.34"></a>
<span class="sourceLineNo">035</span> * @author Mike Bostock<a name="line.35"></a>
<span class="sourceLineNo">036</span> * @author Jared Levy<a name="line.36"></a>
<span class="sourceLineNo">037</span> * @since 3.0<a name="line.37"></a>
<span class="sourceLineNo">038</span> */<a name="line.38"></a>
<span class="sourceLineNo">039</span>@Beta<a name="line.39"></a>
<span class="sourceLineNo">040</span>@GwtCompatible<a name="line.40"></a>
<span class="sourceLineNo">041</span>public final class Constraints {<a name="line.41"></a>
<span class="sourceLineNo">042</span>  private Constraints() {}<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>  // enum singleton pattern<a name="line.44"></a>
<span class="sourceLineNo">045</span>  private enum NotNullConstraint implements Constraint&lt;Object&gt; {<a name="line.45"></a>
<span class="sourceLineNo">046</span>    INSTANCE;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>    @Override<a name="line.48"></a>
<span class="sourceLineNo">049</span>    public Object checkElement(Object element) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>      return checkNotNull(element);<a name="line.50"></a>
<span class="sourceLineNo">051</span>    }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>    @Override public String toString() {<a name="line.53"></a>
<span class="sourceLineNo">054</span>      return "Not null";<a name="line.54"></a>
<span class="sourceLineNo">055</span>    }<a name="line.55"></a>
<span class="sourceLineNo">056</span>  }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>  /**<a name="line.58"></a>
<span class="sourceLineNo">059</span>   * Returns a constraint that verifies that the element is not null. If the<a name="line.59"></a>
<span class="sourceLineNo">060</span>   * element is null, a {@link NullPointerException} is thrown.<a name="line.60"></a>
<span class="sourceLineNo">061</span>   */<a name="line.61"></a>
<span class="sourceLineNo">062</span>  // safe to narrow the type since checkElement returns its argument directly<a name="line.62"></a>
<span class="sourceLineNo">063</span>  @SuppressWarnings("unchecked")<a name="line.63"></a>
<span class="sourceLineNo">064</span>  public static &lt;E&gt; Constraint&lt;E&gt; notNull() {<a name="line.64"></a>
<span class="sourceLineNo">065</span>    return (Constraint&lt;E&gt;) NotNullConstraint.INSTANCE;<a name="line.65"></a>
<span class="sourceLineNo">066</span>  }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>  /**<a name="line.68"></a>
<span class="sourceLineNo">069</span>   * Returns a constrained view of the specified collection, using the specified<a name="line.69"></a>
<span class="sourceLineNo">070</span>   * constraint. Any operations that add new elements to the collection will<a name="line.70"></a>
<span class="sourceLineNo">071</span>   * call the provided constraint. However, this method does not verify that<a name="line.71"></a>
<span class="sourceLineNo">072</span>   * existing elements satisfy the constraint.<a name="line.72"></a>
<span class="sourceLineNo">073</span>   *<a name="line.73"></a>
<span class="sourceLineNo">074</span>   * &lt;p&gt;The returned collection is not serializable.<a name="line.74"></a>
<span class="sourceLineNo">075</span>   *<a name="line.75"></a>
<span class="sourceLineNo">076</span>   * @param collection the collection to constrain<a name="line.76"></a>
<span class="sourceLineNo">077</span>   * @param constraint the constraint that validates added elements<a name="line.77"></a>
<span class="sourceLineNo">078</span>   * @return a constrained view of the collection<a name="line.78"></a>
<span class="sourceLineNo">079</span>   */<a name="line.79"></a>
<span class="sourceLineNo">080</span>  public static &lt;E&gt; Collection&lt;E&gt; constrainedCollection(<a name="line.80"></a>
<span class="sourceLineNo">081</span>      Collection&lt;E&gt; collection, Constraint&lt;? super E&gt; constraint) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>    return new ConstrainedCollection&lt;E&gt;(collection, constraint);<a name="line.82"></a>
<span class="sourceLineNo">083</span>  }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>  /** @see Constraints#constrainedCollection */<a name="line.85"></a>
<span class="sourceLineNo">086</span>  static class ConstrainedCollection&lt;E&gt; extends ForwardingCollection&lt;E&gt; {<a name="line.86"></a>
<span class="sourceLineNo">087</span>    private final Collection&lt;E&gt; delegate;<a name="line.87"></a>
<span class="sourceLineNo">088</span>    private final Constraint&lt;? super E&gt; constraint;<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    public ConstrainedCollection(<a name="line.90"></a>
<span class="sourceLineNo">091</span>        Collection&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.91"></a>
<span class="sourceLineNo">092</span>      this.delegate = checkNotNull(delegate);<a name="line.92"></a>
<span class="sourceLineNo">093</span>      this.constraint = checkNotNull(constraint);<a name="line.93"></a>
<span class="sourceLineNo">094</span>    }<a name="line.94"></a>
<span class="sourceLineNo">095</span>    @Override protected Collection&lt;E&gt; delegate() {<a name="line.95"></a>
<span class="sourceLineNo">096</span>      return delegate;<a name="line.96"></a>
<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
<span class="sourceLineNo">098</span>    @Override public boolean add(E element) {<a name="line.98"></a>
<span class="sourceLineNo">099</span>      constraint.checkElement(element);<a name="line.99"></a>
<span class="sourceLineNo">100</span>      return delegate.add(element);<a name="line.100"></a>
<span class="sourceLineNo">101</span>    }<a name="line.101"></a>
<span class="sourceLineNo">102</span>    @Override public boolean addAll(Collection&lt;? extends E&gt; elements) {<a name="line.102"></a>
<span class="sourceLineNo">103</span>      return delegate.addAll(checkElements(elements, constraint));<a name="line.103"></a>
<span class="sourceLineNo">104</span>    }<a name="line.104"></a>
<span class="sourceLineNo">105</span>  }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span>  /**<a name="line.107"></a>
<span class="sourceLineNo">108</span>   * Returns a constrained view of the specified set, using the specified<a name="line.108"></a>
<span class="sourceLineNo">109</span>   * constraint. Any operations that add new elements to the set will call the<a name="line.109"></a>
<span class="sourceLineNo">110</span>   * provided constraint. However, this method does not verify that existing<a name="line.110"></a>
<span class="sourceLineNo">111</span>   * elements satisfy the constraint.<a name="line.111"></a>
<span class="sourceLineNo">112</span>   *<a name="line.112"></a>
<span class="sourceLineNo">113</span>   * &lt;p&gt;The returned set is not serializable.<a name="line.113"></a>
<span class="sourceLineNo">114</span>   *<a name="line.114"></a>
<span class="sourceLineNo">115</span>   * @param set the set to constrain<a name="line.115"></a>
<span class="sourceLineNo">116</span>   * @param constraint the constraint that validates added elements<a name="line.116"></a>
<span class="sourceLineNo">117</span>   * @return a constrained view of the set<a name="line.117"></a>
<span class="sourceLineNo">118</span>   */<a name="line.118"></a>
<span class="sourceLineNo">119</span>  public static &lt;E&gt; Set&lt;E&gt; constrainedSet(<a name="line.119"></a>
<span class="sourceLineNo">120</span>      Set&lt;E&gt; set, Constraint&lt;? super E&gt; constraint) {<a name="line.120"></a>
<span class="sourceLineNo">121</span>    return new ConstrainedSet&lt;E&gt;(set, constraint);<a name="line.121"></a>
<span class="sourceLineNo">122</span>  }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>  /** @see Constraints#constrainedSet */<a name="line.124"></a>
<span class="sourceLineNo">125</span>  static class ConstrainedSet&lt;E&gt; extends ForwardingSet&lt;E&gt; {<a name="line.125"></a>
<span class="sourceLineNo">126</span>    private final Set&lt;E&gt; delegate;<a name="line.126"></a>
<span class="sourceLineNo">127</span>    private final Constraint&lt;? super E&gt; constraint;<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>    public ConstrainedSet(Set&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.129"></a>
<span class="sourceLineNo">130</span>      this.delegate = checkNotNull(delegate);<a name="line.130"></a>
<span class="sourceLineNo">131</span>      this.constraint = checkNotNull(constraint);<a name="line.131"></a>
<span class="sourceLineNo">132</span>    }<a name="line.132"></a>
<span class="sourceLineNo">133</span>    @Override protected Set&lt;E&gt; delegate() {<a name="line.133"></a>
<span class="sourceLineNo">134</span>      return delegate;<a name="line.134"></a>
<span class="sourceLineNo">135</span>    }<a name="line.135"></a>
<span class="sourceLineNo">136</span>    @Override public boolean add(E element) {<a name="line.136"></a>
<span class="sourceLineNo">137</span>      constraint.checkElement(element);<a name="line.137"></a>
<span class="sourceLineNo">138</span>      return delegate.add(element);<a name="line.138"></a>
<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
<span class="sourceLineNo">140</span>    @Override public boolean addAll(Collection&lt;? extends E&gt; elements) {<a name="line.140"></a>
<span class="sourceLineNo">141</span>      return delegate.addAll(checkElements(elements, constraint));<a name="line.141"></a>
<span class="sourceLineNo">142</span>    }<a name="line.142"></a>
<span class="sourceLineNo">143</span>  }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>  /**<a name="line.145"></a>
<span class="sourceLineNo">146</span>   * Returns a constrained view of the specified sorted set, using the specified<a name="line.146"></a>
<span class="sourceLineNo">147</span>   * constraint. Any operations that add new elements to the sorted set will<a name="line.147"></a>
<span class="sourceLineNo">148</span>   * call the provided constraint. However, this method does not verify that<a name="line.148"></a>
<span class="sourceLineNo">149</span>   * existing elements satisfy the constraint.<a name="line.149"></a>
<span class="sourceLineNo">150</span>   *<a name="line.150"></a>
<span class="sourceLineNo">151</span>   * &lt;p&gt;The returned set is not serializable.<a name="line.151"></a>
<span class="sourceLineNo">152</span>   *<a name="line.152"></a>
<span class="sourceLineNo">153</span>   * @param sortedSet the sorted set to constrain<a name="line.153"></a>
<span class="sourceLineNo">154</span>   * @param constraint the constraint that validates added elements<a name="line.154"></a>
<span class="sourceLineNo">155</span>   * @return a constrained view of the sorted set<a name="line.155"></a>
<span class="sourceLineNo">156</span>   */<a name="line.156"></a>
<span class="sourceLineNo">157</span>  public static &lt;E&gt; SortedSet&lt;E&gt; constrainedSortedSet(<a name="line.157"></a>
<span class="sourceLineNo">158</span>      SortedSet&lt;E&gt; sortedSet, Constraint&lt;? super E&gt; constraint) {<a name="line.158"></a>
<span class="sourceLineNo">159</span>    return new ConstrainedSortedSet&lt;E&gt;(sortedSet, constraint);<a name="line.159"></a>
<span class="sourceLineNo">160</span>  }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>  /** @see Constraints#constrainedSortedSet */<a name="line.162"></a>
<span class="sourceLineNo">163</span>  private static class ConstrainedSortedSet&lt;E&gt; extends ForwardingSortedSet&lt;E&gt; {<a name="line.163"></a>
<span class="sourceLineNo">164</span>    final SortedSet&lt;E&gt; delegate;<a name="line.164"></a>
<span class="sourceLineNo">165</span>    final Constraint&lt;? super E&gt; constraint;<a name="line.165"></a>
<span class="sourceLineNo">166</span><a name="line.166"></a>
<span class="sourceLineNo">167</span>    ConstrainedSortedSet(<a name="line.167"></a>
<span class="sourceLineNo">168</span>        SortedSet&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>      this.delegate = checkNotNull(delegate);<a name="line.169"></a>
<span class="sourceLineNo">170</span>      this.constraint = checkNotNull(constraint);<a name="line.170"></a>
<span class="sourceLineNo">171</span>    }<a name="line.171"></a>
<span class="sourceLineNo">172</span>    @Override protected SortedSet&lt;E&gt; delegate() {<a name="line.172"></a>
<span class="sourceLineNo">173</span>      return delegate;<a name="line.173"></a>
<span class="sourceLineNo">174</span>    }<a name="line.174"></a>
<span class="sourceLineNo">175</span>    @Override public SortedSet&lt;E&gt; headSet(E toElement) {<a name="line.175"></a>
<span class="sourceLineNo">176</span>      return constrainedSortedSet(delegate.headSet(toElement), constraint);<a name="line.176"></a>
<span class="sourceLineNo">177</span>    }<a name="line.177"></a>
<span class="sourceLineNo">178</span>    @Override public SortedSet&lt;E&gt; subSet(E fromElement, E toElement) {<a name="line.178"></a>
<span class="sourceLineNo">179</span>      return constrainedSortedSet(<a name="line.179"></a>
<span class="sourceLineNo">180</span>          delegate.subSet(fromElement, toElement), constraint);<a name="line.180"></a>
<span class="sourceLineNo">181</span>    }<a name="line.181"></a>
<span class="sourceLineNo">182</span>    @Override public SortedSet&lt;E&gt; tailSet(E fromElement) {<a name="line.182"></a>
<span class="sourceLineNo">183</span>      return constrainedSortedSet(delegate.tailSet(fromElement), constraint);<a name="line.183"></a>
<span class="sourceLineNo">184</span>    }<a name="line.184"></a>
<span class="sourceLineNo">185</span>    @Override public boolean add(E element) {<a name="line.185"></a>
<span class="sourceLineNo">186</span>      constraint.checkElement(element);<a name="line.186"></a>
<span class="sourceLineNo">187</span>      return delegate.add(element);<a name="line.187"></a>
<span class="sourceLineNo">188</span>    }<a name="line.188"></a>
<span class="sourceLineNo">189</span>    @Override public boolean addAll(Collection&lt;? extends E&gt; elements) {<a name="line.189"></a>
<span class="sourceLineNo">190</span>      return delegate.addAll(checkElements(elements, constraint));<a name="line.190"></a>
<span class="sourceLineNo">191</span>    }<a name="line.191"></a>
<span class="sourceLineNo">192</span>  }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>  /**<a name="line.194"></a>
<span class="sourceLineNo">195</span>   * Returns a constrained view of the specified list, using the specified<a name="line.195"></a>
<span class="sourceLineNo">196</span>   * constraint. Any operations that add new elements to the list will call the<a name="line.196"></a>
<span class="sourceLineNo">197</span>   * provided constraint. However, this method does not verify that existing<a name="line.197"></a>
<span class="sourceLineNo">198</span>   * elements satisfy the constraint.<a name="line.198"></a>
<span class="sourceLineNo">199</span>   *<a name="line.199"></a>
<span class="sourceLineNo">200</span>   * &lt;p&gt;If {@code list} implements {@link RandomAccess}, so will the returned<a name="line.200"></a>
<span class="sourceLineNo">201</span>   * list. The returned list is not serializable.<a name="line.201"></a>
<span class="sourceLineNo">202</span>   *<a name="line.202"></a>
<span class="sourceLineNo">203</span>   * @param list the list to constrain<a name="line.203"></a>
<span class="sourceLineNo">204</span>   * @param constraint the constraint that validates added elements<a name="line.204"></a>
<span class="sourceLineNo">205</span>   * @return a constrained view of the list<a name="line.205"></a>
<span class="sourceLineNo">206</span>   */<a name="line.206"></a>
<span class="sourceLineNo">207</span>  public static &lt;E&gt; List&lt;E&gt; constrainedList(<a name="line.207"></a>
<span class="sourceLineNo">208</span>      List&lt;E&gt; list, Constraint&lt;? super E&gt; constraint) {<a name="line.208"></a>
<span class="sourceLineNo">209</span>    return (list instanceof RandomAccess)<a name="line.209"></a>
<span class="sourceLineNo">210</span>        ? new ConstrainedRandomAccessList&lt;E&gt;(list, constraint)<a name="line.210"></a>
<span class="sourceLineNo">211</span>        : new ConstrainedList&lt;E&gt;(list, constraint);<a name="line.211"></a>
<span class="sourceLineNo">212</span>  }<a name="line.212"></a>
<span class="sourceLineNo">213</span><a name="line.213"></a>
<span class="sourceLineNo">214</span>  /** @see Constraints#constrainedList */<a name="line.214"></a>
<span class="sourceLineNo">215</span>  @GwtCompatible<a name="line.215"></a>
<span class="sourceLineNo">216</span>  private static class ConstrainedList&lt;E&gt; extends ForwardingList&lt;E&gt; {<a name="line.216"></a>
<span class="sourceLineNo">217</span>    final List&lt;E&gt; delegate;<a name="line.217"></a>
<span class="sourceLineNo">218</span>    final Constraint&lt;? super E&gt; constraint;<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span>    ConstrainedList(List&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.220"></a>
<span class="sourceLineNo">221</span>      this.delegate = checkNotNull(delegate);<a name="line.221"></a>
<span class="sourceLineNo">222</span>      this.constraint = checkNotNull(constraint);<a name="line.222"></a>
<span class="sourceLineNo">223</span>    }<a name="line.223"></a>
<span class="sourceLineNo">224</span>    @Override protected List&lt;E&gt; delegate() {<a name="line.224"></a>
<span class="sourceLineNo">225</span>      return delegate;<a name="line.225"></a>
<span class="sourceLineNo">226</span>    }<a name="line.226"></a>
<span class="sourceLineNo">227</span><a name="line.227"></a>
<span class="sourceLineNo">228</span>    @Override public boolean add(E element) {<a name="line.228"></a>
<span class="sourceLineNo">229</span>      constraint.checkElement(element);<a name="line.229"></a>
<span class="sourceLineNo">230</span>      return delegate.add(element);<a name="line.230"></a>
<span class="sourceLineNo">231</span>    }<a name="line.231"></a>
<span class="sourceLineNo">232</span>    @Override public void add(int index, E element) {<a name="line.232"></a>
<span class="sourceLineNo">233</span>      constraint.checkElement(element);<a name="line.233"></a>
<span class="sourceLineNo">234</span>      delegate.add(index, element);<a name="line.234"></a>
<span class="sourceLineNo">235</span>    }<a name="line.235"></a>
<span class="sourceLineNo">236</span>    @Override public boolean addAll(Collection&lt;? extends E&gt; elements) {<a name="line.236"></a>
<span class="sourceLineNo">237</span>      return delegate.addAll(checkElements(elements, constraint));<a name="line.237"></a>
<span class="sourceLineNo">238</span>    }<a name="line.238"></a>
<span class="sourceLineNo">239</span>    @Override public boolean addAll(int index, Collection&lt;? extends E&gt; elements)<a name="line.239"></a>
<span class="sourceLineNo">240</span>    {<a name="line.240"></a>
<span class="sourceLineNo">241</span>      return delegate.addAll(index, checkElements(elements, constraint));<a name="line.241"></a>
<span class="sourceLineNo">242</span>    }<a name="line.242"></a>
<span class="sourceLineNo">243</span>    @Override public ListIterator&lt;E&gt; listIterator() {<a name="line.243"></a>
<span class="sourceLineNo">244</span>      return constrainedListIterator(delegate.listIterator(), constraint);<a name="line.244"></a>
<span class="sourceLineNo">245</span>    }<a name="line.245"></a>
<span class="sourceLineNo">246</span>    @Override public ListIterator&lt;E&gt; listIterator(int index) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>      return constrainedListIterator(delegate.listIterator(index), constraint);<a name="line.247"></a>
<span class="sourceLineNo">248</span>    }<a name="line.248"></a>
<span class="sourceLineNo">249</span>    @Override public E set(int index, E element) {<a name="line.249"></a>
<span class="sourceLineNo">250</span>      constraint.checkElement(element);<a name="line.250"></a>
<span class="sourceLineNo">251</span>      return delegate.set(index, element);<a name="line.251"></a>
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<span class="sourceLineNo">253</span>    @Override public List&lt;E&gt; subList(int fromIndex, int toIndex) {<a name="line.253"></a>
<span class="sourceLineNo">254</span>      return constrainedList(<a name="line.254"></a>
<span class="sourceLineNo">255</span>          delegate.subList(fromIndex, toIndex), constraint);<a name="line.255"></a>
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<span class="sourceLineNo">258</span><a name="line.258"></a>
<span class="sourceLineNo">259</span>  /** @see Constraints#constrainedList */<a name="line.259"></a>
<span class="sourceLineNo">260</span>  static class ConstrainedRandomAccessList&lt;E&gt; extends ConstrainedList&lt;E&gt;<a name="line.260"></a>
<span class="sourceLineNo">261</span>      implements RandomAccess {<a name="line.261"></a>
<span class="sourceLineNo">262</span>    ConstrainedRandomAccessList(<a name="line.262"></a>
<span class="sourceLineNo">263</span>        List&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.263"></a>
<span class="sourceLineNo">264</span>      super(delegate, constraint);<a name="line.264"></a>
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<span class="sourceLineNo">267</span><a name="line.267"></a>
<span class="sourceLineNo">268</span>  /**<a name="line.268"></a>
<span class="sourceLineNo">269</span>   * Returns a constrained view of the specified list iterator, using the<a name="line.269"></a>
<span class="sourceLineNo">270</span>   * specified constraint. Any operations that would add new elements to the<a name="line.270"></a>
<span class="sourceLineNo">271</span>   * underlying list will be verified by the constraint.<a name="line.271"></a>
<span class="sourceLineNo">272</span>   *<a name="line.272"></a>
<span class="sourceLineNo">273</span>   * @param listIterator the iterator for which to return a constrained view<a name="line.273"></a>
<span class="sourceLineNo">274</span>   * @param constraint the constraint for elements in the list<a name="line.274"></a>
<span class="sourceLineNo">275</span>   * @return a constrained view of the specified iterator<a name="line.275"></a>
<span class="sourceLineNo">276</span>   */<a name="line.276"></a>
<span class="sourceLineNo">277</span>  private static &lt;E&gt; ListIterator&lt;E&gt; constrainedListIterator(<a name="line.277"></a>
<span class="sourceLineNo">278</span>      ListIterator&lt;E&gt; listIterator, Constraint&lt;? super E&gt; constraint) {<a name="line.278"></a>
<span class="sourceLineNo">279</span>    return new ConstrainedListIterator&lt;E&gt;(listIterator, constraint);<a name="line.279"></a>
<span class="sourceLineNo">280</span>  }<a name="line.280"></a>
<span class="sourceLineNo">281</span><a name="line.281"></a>
<span class="sourceLineNo">282</span>  /** @see Constraints#constrainedListIterator */<a name="line.282"></a>
<span class="sourceLineNo">283</span>  static class ConstrainedListIterator&lt;E&gt; extends ForwardingListIterator&lt;E&gt; {<a name="line.283"></a>
<span class="sourceLineNo">284</span>    private final ListIterator&lt;E&gt; delegate;<a name="line.284"></a>
<span class="sourceLineNo">285</span>    private final Constraint&lt;? super E&gt; constraint;<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>    public ConstrainedListIterator(<a name="line.287"></a>
<span class="sourceLineNo">288</span>        ListIterator&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.288"></a>
<span class="sourceLineNo">289</span>      this.delegate = delegate;<a name="line.289"></a>
<span class="sourceLineNo">290</span>      this.constraint = constraint;<a name="line.290"></a>
<span class="sourceLineNo">291</span>    }<a name="line.291"></a>
<span class="sourceLineNo">292</span>    @Override protected ListIterator&lt;E&gt; delegate() {<a name="line.292"></a>
<span class="sourceLineNo">293</span>      return delegate;<a name="line.293"></a>
<span class="sourceLineNo">294</span>    }<a name="line.294"></a>
<span class="sourceLineNo">295</span><a name="line.295"></a>
<span class="sourceLineNo">296</span>    @Override public void add(E element) {<a name="line.296"></a>
<span class="sourceLineNo">297</span>      constraint.checkElement(element);<a name="line.297"></a>
<span class="sourceLineNo">298</span>      delegate.add(element);<a name="line.298"></a>
<span class="sourceLineNo">299</span>    }<a name="line.299"></a>
<span class="sourceLineNo">300</span>    @Override public void set(E element) {<a name="line.300"></a>
<span class="sourceLineNo">301</span>      constraint.checkElement(element);<a name="line.301"></a>
<span class="sourceLineNo">302</span>      delegate.set(element);<a name="line.302"></a>
<span class="sourceLineNo">303</span>    }<a name="line.303"></a>
<span class="sourceLineNo">304</span>  }<a name="line.304"></a>
<span class="sourceLineNo">305</span><a name="line.305"></a>
<span class="sourceLineNo">306</span>  static &lt;E&gt; Collection&lt;E&gt; constrainedTypePreservingCollection(<a name="line.306"></a>
<span class="sourceLineNo">307</span>      Collection&lt;E&gt; collection, Constraint&lt;E&gt; constraint) {<a name="line.307"></a>
<span class="sourceLineNo">308</span>    if (collection instanceof SortedSet) {<a name="line.308"></a>
<span class="sourceLineNo">309</span>      return constrainedSortedSet((SortedSet&lt;E&gt;) collection, constraint);<a name="line.309"></a>
<span class="sourceLineNo">310</span>    } else if (collection instanceof Set) {<a name="line.310"></a>
<span class="sourceLineNo">311</span>      return constrainedSet((Set&lt;E&gt;) collection, constraint);<a name="line.311"></a>
<span class="sourceLineNo">312</span>    } else if (collection instanceof List) {<a name="line.312"></a>
<span class="sourceLineNo">313</span>      return constrainedList((List&lt;E&gt;) collection, constraint);<a name="line.313"></a>
<span class="sourceLineNo">314</span>    } else {<a name="line.314"></a>
<span class="sourceLineNo">315</span>      return constrainedCollection(collection, constraint);<a name="line.315"></a>
<span class="sourceLineNo">316</span>    }<a name="line.316"></a>
<span class="sourceLineNo">317</span>  }<a name="line.317"></a>
<span class="sourceLineNo">318</span><a name="line.318"></a>
<span class="sourceLineNo">319</span>  /**<a name="line.319"></a>
<span class="sourceLineNo">320</span>   * Returns a constrained view of the specified multiset, using the specified<a name="line.320"></a>
<span class="sourceLineNo">321</span>   * constraint. Any operations that add new elements to the multiset will call<a name="line.321"></a>
<span class="sourceLineNo">322</span>   * the provided constraint. However, this method does not verify that<a name="line.322"></a>
<span class="sourceLineNo">323</span>   * existing elements satisfy the constraint.<a name="line.323"></a>
<span class="sourceLineNo">324</span>   *<a name="line.324"></a>
<span class="sourceLineNo">325</span>   * &lt;p&gt;The returned multiset is not serializable.<a name="line.325"></a>
<span class="sourceLineNo">326</span>   *<a name="line.326"></a>
<span class="sourceLineNo">327</span>   * @param multiset the multiset to constrain<a name="line.327"></a>
<span class="sourceLineNo">328</span>   * @param constraint the constraint that validates added elements<a name="line.328"></a>
<span class="sourceLineNo">329</span>   * @return a constrained view of the multiset<a name="line.329"></a>
<span class="sourceLineNo">330</span>   */<a name="line.330"></a>
<span class="sourceLineNo">331</span>  public static &lt;E&gt; Multiset&lt;E&gt; constrainedMultiset(<a name="line.331"></a>
<span class="sourceLineNo">332</span>      Multiset&lt;E&gt; multiset, Constraint&lt;? super E&gt; constraint) {<a name="line.332"></a>
<span class="sourceLineNo">333</span>    return new ConstrainedMultiset&lt;E&gt;(multiset, constraint);<a name="line.333"></a>
<span class="sourceLineNo">334</span>  }<a name="line.334"></a>
<span class="sourceLineNo">335</span><a name="line.335"></a>
<span class="sourceLineNo">336</span>  /** @see Constraints#constrainedMultiset */<a name="line.336"></a>
<span class="sourceLineNo">337</span>  static class ConstrainedMultiset&lt;E&gt; extends ForwardingMultiset&lt;E&gt; {<a name="line.337"></a>
<span class="sourceLineNo">338</span>    private Multiset&lt;E&gt; delegate;<a name="line.338"></a>
<span class="sourceLineNo">339</span>    private final Constraint&lt;? super E&gt; constraint;<a name="line.339"></a>
<span class="sourceLineNo">340</span><a name="line.340"></a>
<span class="sourceLineNo">341</span>    public ConstrainedMultiset(<a name="line.341"></a>
<span class="sourceLineNo">342</span>        Multiset&lt;E&gt; delegate, Constraint&lt;? super E&gt; constraint) {<a name="line.342"></a>
<span class="sourceLineNo">343</span>      this.delegate = checkNotNull(delegate);<a name="line.343"></a>
<span class="sourceLineNo">344</span>      this.constraint = checkNotNull(constraint);<a name="line.344"></a>
<span class="sourceLineNo">345</span>    }<a name="line.345"></a>
<span class="sourceLineNo">346</span>    @Override protected Multiset&lt;E&gt; delegate() {<a name="line.346"></a>
<span class="sourceLineNo">347</span>      return delegate;<a name="line.347"></a>
<span class="sourceLineNo">348</span>    }<a name="line.348"></a>
<span class="sourceLineNo">349</span>    @Override public boolean add(E element) {<a name="line.349"></a>
<span class="sourceLineNo">350</span>      return standardAdd(element);<a name="line.350"></a>
<span class="sourceLineNo">351</span>    }<a name="line.351"></a>
<span class="sourceLineNo">352</span>    @Override public boolean addAll(Collection&lt;? extends E&gt; elements) {<a name="line.352"></a>
<span class="sourceLineNo">353</span>      return delegate.addAll(checkElements(elements, constraint));<a name="line.353"></a>
<span class="sourceLineNo">354</span>    }<a name="line.354"></a>
<span class="sourceLineNo">355</span>    @Override public int add(E element, int occurrences) {<a name="line.355"></a>
<span class="sourceLineNo">356</span>      constraint.checkElement(element);<a name="line.356"></a>
<span class="sourceLineNo">357</span>      return delegate.add(element, occurrences);<a name="line.357"></a>
<span class="sourceLineNo">358</span>    }<a name="line.358"></a>
<span class="sourceLineNo">359</span>    @Override public int setCount(E element, int count) {<a name="line.359"></a>
<span class="sourceLineNo">360</span>      constraint.checkElement(element);<a name="line.360"></a>
<span class="sourceLineNo">361</span>      return delegate.setCount(element, count);<a name="line.361"></a>
<span class="sourceLineNo">362</span>    }<a name="line.362"></a>
<span class="sourceLineNo">363</span>    @Override public boolean setCount(E element, int oldCount, int newCount) {<a name="line.363"></a>
<span class="sourceLineNo">364</span>      constraint.checkElement(element);<a name="line.364"></a>
<span class="sourceLineNo">365</span>      return delegate.setCount(element, oldCount, newCount);<a name="line.365"></a>
<span class="sourceLineNo">366</span>    }<a name="line.366"></a>
<span class="sourceLineNo">367</span>  }<a name="line.367"></a>
<span class="sourceLineNo">368</span><a name="line.368"></a>
<span class="sourceLineNo">369</span>  /*<a name="line.369"></a>
<span class="sourceLineNo">370</span>   * TODO(kevinb): For better performance, avoid making a copy of the elements<a name="line.370"></a>
<span class="sourceLineNo">371</span>   * by having addAll() call add() repeatedly instead.<a name="line.371"></a>
<span class="sourceLineNo">372</span>   */<a name="line.372"></a>
<span class="sourceLineNo">373</span><a name="line.373"></a>
<span class="sourceLineNo">374</span>  private static &lt;E&gt; Collection&lt;E&gt; checkElements(<a name="line.374"></a>
<span class="sourceLineNo">375</span>      Collection&lt;E&gt; elements, Constraint&lt;? super E&gt; constraint) {<a name="line.375"></a>
<span class="sourceLineNo">376</span>    Collection&lt;E&gt; copy = Lists.newArrayList(elements);<a name="line.376"></a>
<span class="sourceLineNo">377</span>    for (E element : copy) {<a name="line.377"></a>
<span class="sourceLineNo">378</span>      constraint.checkElement(element);<a name="line.378"></a>
<span class="sourceLineNo">379</span>    }<a name="line.379"></a>
<span class="sourceLineNo">380</span>    return copy;<a name="line.380"></a>
<span class="sourceLineNo">381</span>  }<a name="line.381"></a>
<span class="sourceLineNo">382</span>}<a name="line.382"></a>




























































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